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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35584b2bb7d031696ed5af63ad5bf09a0800abf7c61ebfe58397bd2a73818257' 
  AND token = 'MFdUmH1a5R90rseJ3Vnm+jKDtojJama96KAuFvvnJm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}